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Gel electrolyte and gel electrolytic cell

A technology of gel electrolyte and electrolyte, which is applied in non-aqueous electrolyte batteries, non-aqueous electrolyte batteries, electrolyte immobilization/gelation, etc., can solve problems such as difficulties in low-temperature characteristics, and achieve the goal of improving overall battery performance and cycle characteristics Effect

Inactive Publication Date: 2004-03-31
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to manufacture lithium-ion secondary batteries that can exhibit satisfactory cycle characteristics without impairing low-temperature characteristics and load characteristics (large current characteristics) or gel electrolyte stability

Method used

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  • Gel electrolyte and gel electrolytic cell
  • Gel electrolyte and gel electrolytic cell
  • Gel electrolyte and gel electrolytic cell

Examples

Experimental program
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preparation example Construction

[0052] A method of manufacturing the gel electrolyte battery 1 will be described below.

[0053] For the positive electrode 2, a positive electrode mixture containing a positive electrode active material and a binder is uniformly coated on a metal foil serving as a positive electrode current collector 2b, for example, on an aluminum foil, and dried in situ to form an active material layer of the positive electrode 2 2a, to prepare the positive electrode sheet. As the binder of the positive electrode mixture, any available known binder can be used. In addition, any known usable additives and the like may also be added to the positive electrode mixture.

[0054] Then, gel electrolyte layer 4 is formed on active material layer 2 a of positive electrode 2 . In order to form the gel electrolyte layer 4, first, an electrolyte salt is dissolved in a nonaqueous solvent to prepare a nonaqueous electrolytic solution. The matrix polymer is added to the non-aqueous electrolytic solutio...

Embodiment 1

[0068] First, positive and negative electrodes are prepared.

[0069] To prepare the positive electrode, 92% by weight of lithium cobaltate (LiCoO 2 ), 3% (weight) of polyvinylidene fluoride powder and 5% (weight) of graphite powder are dispersed in N-methylpyrrolidone (NMP) to make a slurry, and this slurry is coated on the positive electrode collector both sides of the aluminum foil. The obtained product was dried at 100° C. for 24 hours under reduced pressure. The dried product is pressed with a roller press under appropriate pressure to obtain a positive electrode sheet.

[0070] This positive electrode sheet was cut into a rectangle of 50 mm×300 mm, and an aluminum foil wire with a thickness of 50 μm was welded to the part of the positive electrode current collector not coated with the positive electrode mixture as a positive electrode terminal. Thus, a positive electrode was produced.

[0071] In order to prepare the negative electrode, 91% (weight) of artificial gra...

Embodiment 1 to 32

[0078] A gel electrolyte battery was prepared in the same manner as in Example 1 except that the gel electrolyte composition listed in Table 1 was used.

[0079] Among them, in Example 21, LiN(CF 3 SO 2 ) 2 As an electrolyte salt to replace LiPF 6 .

[0080] In Example 22, lithium nickel cobaltate LiCo 0.8 Ni 0.2 o 2 It is used as a positive electrode active material to replace lithium cobalt oxide, and carbon that is difficult to graphitize is used instead of artificial graphite as a negative electrode active material.

[0081] Also, in Examples 23 to 28, difluoroanisole was added in an amount of 1% by weight to the solvent for the electrolytic solution.

[0082] EC(weight%)

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PUM

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Abstract

A gel electrolyte comprised of a non-aqueous electrolytic solution immersed in a matrix polymer, in which ion conductivity of a solvent is improved and superior cyclic characteristics are achieved. To this end, the gel electrolyte includes an electrolyte, a matrix polymer and a non-aqueous solvent. The non-aqueous solvent is a mixed solvent of ethylene carbonate (EC), propylene carbonate (PC) and gamma -butyrolactone (GBL). The non-aqueous solvent is of a weight composition in an area in a triangular phase diagram (EC, PC, GBL) surrounded by a point (70, 30, 0), a point (55, 15, 30), a point (15, 55, 30) and a point (30, 70, 0). A gel electrolyte battery employing this electrolyte is also disclosed.

Description

technical field [0001] The present invention relates to a gel electrolyte composed of a nonaqueous electrolytic solution immersed in a matrix polymer, and a gel electrolyte battery using the same. Background technique [0002] Recently, more and more attention has been paid to batteries as light sources for portable electronic equipment such as video cameras or notebook personal computers. In order to reduce the size and weight of electronic equipment, there is an increasing demand for batteries that not only have a large capacity but also are small in weight and save space. From this point of view, lithium batteries having high energy density and high output density are suitable as light sources for portable electronic devices. [0003] Lithium batteries are expected to have a variety of shapes, such as batteries exhibiting flexibility and a large degree of shape freedom, sheet batteries with reduced thickness and large area, or card batteries with reduced area and thickne...

Claims

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Application Information

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IPC IPC(8): H01B1/06H01M6/22H01M10/05H01M10/052H01M10/0525H01M10/0565H01M10/0567H01M10/0569H01M50/409
CPCH01M10/0567Y02E60/122H01M2300/004H01M10/0565H01M10/0569H01M2300/0085H01M10/052H01M6/22H01M2/16H01M10/0525H01M50/409
Inventor 涉谷真志生后藤习志
Owner MURATA MFG CO LTD
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